To reproduce 
- Make LSB the default bible  (I started with my normal default ESV)
- Search Yahweh OR Yahweh's in Psalms in LSB  (for simplicity)- create a Passage List  (PL-1 635 passages)
 
- Search lemma.h:יהוה in Psalms in LHB  - create a Passage List (PL-2 635 passages)
 
- Note that each PL defaults to the bible in the Search
- Merge PL-1 with PL-2 by Difference  
 
    
- Now Merge in reverse direction
 
    
Note that LSB is the default bible in both merges.
- Why does Ps 11:1 appear as a difference? In both bibles the search result is in Ps 11:1.  Ps 11:title-1 above references the heading that contains Yahweh in LSB!
- Why does Ps 13:5-6 appear as a difference  when both bibles have the search result in v.6.
- Were the other search results in Ps 13 aligned such that there is no difference?
- Ps 15:1 to the end are all similar issues to Ps 11:1
- In many other respects there appears to have been a correct alignment e.g. Ps 20
- If I change the bible to LHB in the second Difference list (above) the "title"s disappear, but changing has no effect on the first list.